Top portion of a computer keyboard



FIG. 1 is a top view of the top portion of a computer keyboard which constitutes my new design;

FIG. 2 is a front view of the computer keyboard shown in FIG. 1;

FIG. 3 is a rear view of the computer keyboard shown in FIG. 1;

FIG. 4 is a left side view of the computer keyboard shown in FIG. 1; and,

FIG. 5 is a right side view of the computer keyboard shown in FIG. 1.

The broken lines are shown in the views for illustrative purposes only and form no part of the claimed design. 

The ornamental design for the top portion of a computer keyboard, as shown and described. 